<?php
/**
* @file
* @version 1.0
* @author   网海浪子
* @date 2006-3-30
* @email sxf02615@163.com
* @brief    验证码文件类
*
*/

class CCheckCodeFile
{
//验证码位数
private $mCheckCodeNum = 4;

//产生的验证码
private $mCheckCode   = '';

//验证码的图片
private $mCheckImage = '';

//干扰像素
private $mDisturbColor = '';

//验证码的图片宽度
private $mCheckImageWidth = '80';

//验证码的图片宽度
private $mCheckImageHeight = '20';

/**
*
* @brief 输出头
*
*/
private function OutFileHeader()
{
header ("Content-type: image/png");
}

/**
*
* @brief 产生验证码
*
*/
private function CreateCheckCode()
{
$this->mCheckCode = strtoupper(substr(md5(rand()),0,$this->mCheckCodeNum));
return $this->mCheckCode;
}

/**
*
* @brief 产生验证码图片
*
*/
private function CreateImage()
{
$this->mCheckImage = @imagecreate ($this->mCheckImageWidth,$this->mCheckImageHeight);
imagecolorallocate ($this->mCheckImage, 200, 200, 200);
return $this->mCheckImage;
}

/**
*
* @brief 设置图片的干扰像素
*
*/
private function SetDisturbColor()
{
for ($i=0;$i<=128;$i++)
{
   $this->mDisturbColor = imagecolorallocate ($this->mCheckImage, rand(0,255), rand(0,255), rand(0,255));
   imagesetpixel($this->mCheckImage,rand(2,128),rand(2,38),$this->mDisturbColor);
}
}

/**
*
* @brief 设置验证码图片的大小
*
* @param $width 宽
*
* @param $height 高 
*
*/
public function SetCheckImageWH($width,$height)
{
if($width==''||$height=='')return false;
$this->mCheckImageWidth = $width;
$this->mCheckImageHeight = $height;
return true;
}

/**
*
* @brief 在验证码图片上逐个画上验证码
*
*/
private function WriteCheckCodeToImage()
{
for ($i=0;$i<=$this->mCheckCodeNum;$i++)
{
   $bg_color = imagecolorallocate ($this->mCheckImage, rand(0,255), rand(0,128), rand(0,255));
   $x = floor($this->mCheckImageWidth/$this->mCheckCodeNum)*$i;
   $y = rand(0,$this->mCheckImageHeight-15);
   imagechar ($this->mCheckImage, 5, $x, $y, $this->mCheckCode[$i], $bg_color);
}
}

/**
*
* @brief 输出验证码图片
*
*/
public function OutCheckImage()
{
$this ->OutFileHeader();
$this ->CreateCheckCode();
$this ->CreateImage();
$this ->SetDisturbColor();
$this ->WriteCheckCodeToImage();
imagepng($this->mCheckImage);
imagedestroy($this->mCheckImage);
}
}
$c_check_code_image = new CCheckCodeFile();
//$c_check_code_image ->SetCheckImageWH(55,20);//设置显示验证码图片的尺寸
$c_check_code_image ->OutCheckImage();
?>
